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Finding the Fourth Proportional to 3,212.80, 4,818.72 and 904

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Solution

The fourth proportional to 3,212.80, 4,818.72 and 904 is: 1,355.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,212.80 : 4,818.72 = 904 : x
  2. Step 2: Convert to fraction form
    3,212.80/4,818.72 = 904/x
  3. Step 3: Cross multiply
    3,212.80x = 4,818.72 × 904
  4. Step 4: Simplify right side
    3,212.80x = 4,356,122.88
  5. Step 5: Solve for x
    x = 4,356,122.88/3,212.80
  6. Step 6: Final answer
    x = 1,355.86

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.